Strong quantitative benchmarking of quantum optical devices

Abstract

Quantum communication devices, such as quantum repeaters, quantum memories, or quantum channels, are unavoidably exposed to imperfections. However, the presence of imperfections can be tolerated, as long as we can verify such devices retain their quantum advantages. Benchmarks based on witnessing entanglement have proven useful for verifying the true quantum nature of these devices. The next challenge is to characterize how strongly a device is within the quantum domain. We present a method, based on entanglement measures and rigorous state truncation, which allows us to characterize the degree of quantumness of optical devices. This method serves as a quantitative extension to a large class of previously-known quantum benchmarks, requiring no additional information beyond what is already used for the non-quantitative benchmarks.

11 pages, 7 figures. Comments are welcome. ver 2: Improved figures, no changes to main text

References in corpus (9)

• When are correlations quantum? -- Verification and quantification of entanglement by simple measurements
• Security of Binary Modulated Continuous Variable Quantum Key Distribution under Collective Attacks
• Testing Quantum Devices: Practical Entanglement Verification in Bipartite Optical Systems
• Squeezing the limit: Quantum benchmarks for the teleportation and storage of squeezed states
• Quantum Benchmark for Teleportation and Storage of Squeezed States
• Witnessing effective entanglement in a continuous variable prepare&measure setup and application to a QKD scheme using postselection
• Phase-Covariant Quantum Benchmarks
• Verification of quantum-domain process using two non-orthogonal states
• Probing the quantumness of channels with mixed states